Overview
Goal	To manage logical volumes from the command line.
Objectives	Describe logical volume management components and concepts. Manage logical volumes. Extend logical volumes.
Sections	Logical Volume Management Concepts (and Practice) Managing Logical Volumes (and Practice) Extending Logical Volumes (and Practice)
Lab	Managing Logical Volume Management (LVM) Storage

Logical Volume Management Concepts

Logical volume management building blocks include storage devices, physical volumes made of physical extents, volume groups to pool PVs and host logical volumes, and a suitable file system added to the LV; for example, xfs or ext4.

Objectives

After completing this section, students should be able to describe LVM components.

Logical volume management (LVM) concepts

Logical volumes and logical volume management make it easier to manage disk space. If a LVM-hosted file system needs more space, it can be allocated to its logical volume from the free space in its volume group and the file system can be resized. If a disk starts to fail, a replacement disk can be registered as a physical volume with the volume group and the logical volume's extents can be migrated to the new disk.

Figure 10.1: Logical volume management components

LVM Definitions

Physical devices are the storage devices used to persist data stored in a logical volume. These are block devices and could be disk partitions, whole disks, RAID arrays, or SAN disks. A device must be initialized as an LVM physical volume in order to be used with LVM. The entire "device" will be used as a physical volume.
Physical volumes (PV) are used to register underlying physical devices for use in volume groups. LVM automatically segments PVs into physical extents (PE); these are small chunks of data that act as the smallest storage block on a PV.
Volume groups (VG) are storage pools made up of one or more physical volumes. A PV can only be allocated to a single VG. A VG can consist of unused space and any number of logical volumes.
Logical volumes (LV) are created from free physical extents in a volume group and provide the "storage" device used by applications, users, and the operating system. LVs are a collection of logical extents (LE), which map to physical extents, the smallest storage chunk of a PV. By default, each LE will map to one PE. Setting specific LV options will change this mapping; for example, mirroring causes each LE to map to two PEs.

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Is It possible to reset root password when the system is on multi-user.target?

jennifer1987

27 lip 2023

Hi thereWell, i have a question, Is It possible to reset root password when the system is on multi-user.target? I was not be able to found a foro o some information related with this and another question that I have, If the grub menu dont show up, is it posible to reset the root password?

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Red Hat System Administration II (RH134)

Haley_Ruccio

21 lip 2023

Build the skills to perform the key tasks needed to become a full-time Linux administratorRed Hat System Administration II (RH134) is the second part of the RHCSA training track for IT professionals who have already attended Red Hat System Administration I. The course goes deeper into core Linux system administration skills in storage configuration and management, installation and deployment of Red Hat Enterprise Linux, management of security features such as SELinux, control of recurring system tasks, management of the boot process and troubleshooting, basic system tuning, and command-line automation and productivity. This course assumes that students have attended Red Hat System Administration I (RH124).Experienced Linux administrators who seek rapid preparation for the RHCSA certification should instead start with RHCSA Rapid Track (RH199).This course is based on Red Hat Enterprise Linux 9.0.Course summaryInstall Red Hat Enterprise Linux using scalable methodsAccess security files, file systems, and networksExecute shell scripting and automation techniquesManage storage devices, logical volumes, and file systemsManage security and system accessControl the boot process and system servicesRun containersAudience for this courseThis course is geared toward Windows system administrators, network administrators, and other system administrators who are interested in supplementing current skills or backstopping other team members, in addition to Linux system administrators who are responsible for these tasks:Configuring, installing, upgrading, and maintaining Linux systems using established standards and proceduresProviding operational supportManaging systems for monitoring system performance and availabilityWriting and deploying scripts for task automation and system administrationRecommended trainingSuccessful completion of Red Hat System Administration I (RH124) is recommended.Experienced Linux administrators seeking to accelerate their path toward becoming a Red Hat Certified System Administrator should start with the RHCSA Rapid Track course (RH199).Take our free assessment to gauge whether this offering is the best fit for your skills.Technology considerationsThere are no special technology requirements.This course is not designed for bring your own device (BYOD).Internet access is not required, but is recommended to allow students to research and access Red Hat online resources.

Welcome to the Red Hat System Administration II (RH134) group in the Red Hat Learning Community!

Deanna

18 lip 2023

We are excited to launch a space dedicated to the Red Hat Training course Red Hat System Administration II! To gain the most value from this group - click the "Join Group" button in the upper right hand corner.We encourage group members to collaborate in this group to discuss topics, ask questions, share best practices and tips, provide course feedback, and share their accomplishments as it relates to RH134.Read more about Red Hat System Administration II here.

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